WO2021155453A1

WO2021155453A1 - Straw walker for grain harvester

Info

Publication number: WO2021155453A1
Application number: PCT/BR2021/050050
Authority: WO
Inventors: Gerhard DOWICH
Original assignee: LINDENMAYR DÖWICH, Guilherme
Priority date: 2020-02-05
Filing date: 2021-02-04
Publication date: 2021-08-12
Also published as: BR102020002428A2; AR121320A1; BR102020002428B1

Abstract

The improved straw walker comprises the alignment of inclined screens (1 and 2) arranged in a stepped manner, a flat rear screen (3) and an end loss monitor (4). The side plates (5) have stepped successive ramps with the upper edge having rounded vertices (51 and 52) and serrated upper edges (53). The front screen (1) has slots (11) that are wider than the slots (21) of the intermediate screens (2), being responsible for increasing the flow. The floor (12, 22, 32) for the three types of screen (1, 2, 3) comprises a shaped plate (13, 23, 33) that has parallel, longitudinal slots (11, 21, 31) interrupted by cross-members (14, 24, 34). The bulkheads (8) for closing the rear end of the inclined screens are provided with circular openings (81). Serrated guide plates (7) are fixed to the cross-members of the floor (12, 22, 32) and to the bulkheads (8) of the inclined screens (1 and 2).

Description

STRAW DRIVERS FOR GRAIN HARVESTERS Technological sector of invention

[01] The present invention belongs to the technological sector of agricultural equipment and implements and refers, more specifically, to the improvement developed in the straw harvester for grain harvester that increases productivity due to the reduction of grain loss, even when the machine performs harvesting at high speed.

State of the art

[02] Combined harvesters perform the operation of threshing (harvesting) the crop with the subsequent operation of threshing the grain, that is, separating the grain from the straw. For this, the grain harvesters are equipped with an internal device, commonly known as a straw puller, which has an oscillating movement and has the function of separating the grain from the straw in the operation subsequent to the threshing carried out in the harvester's cylinder.

[03] The patent document MU 8500965-2 describes an improved straw walker consisting of the alignment of sieves. The sieves are mounted between side plates in the shape of inclined steps, whose upper edges are serrated. Between the side plates, spaced crossbars are placed that act as sieves (grills) for the collection of grains. This straw walker comprises five sieves in the form of inclined steps, one in front and four in between, and a rear sieve that is horizontal. All these sieves are provided with short plates provided with two axially aligned triangular projections, said plates being positioned centrally and longitudinally in the middle posterior portion. However, this straw walker has low productivity, not showing sufficient efficiency when the harvester operates at increased speed.

[04] The US patent document 5,487,703 describes an improved straw walker consisting of side plates where four horizontal steps are mounted on the front portion followed by a long rear ramp. Side plates feature serrated top edges. In the ramp section are centrally arranged plates with triangular protrusions of increasing height and axially aligned. This solution results in a device of greater complexity, which leads to the addition of material with the consequent increase in weight and in manufacturing and assembly operations, significantly increasing the harvester's weight and manufacturing cost.

News and objectives of the invention

[05] The objective of the present invention is an improvement developed in straw bags for a grain harvester that results in better efficiency in straw extraction, adapting to the increase in material flow resulting from the operation of modern machines that are capable of harvesting in larger quantities. speeds.

[06] The improved straw walker comprises the alignment of six inclined sieves arranged in steps, one front and five intermediate, which set is followed by a horizontal rear sieve. A loss monitor compartment completes the straw walker.

[07] The front sieve has wider slots than the intermediate sieves and the rear sieve, whose increased slot width increases the flow of the first step, improving performance and reducing losses.

[08] The side plates have the form of successive ramps in steps, but are endowed with an upper contour with rounded vertices that improve the interaction with the straw and, consequently, optimize the process of its separation. The rounded radii of the edges of the side plates also contribute to the plate not suffering ruptures, as they do not characterize stress concentration points, since “sharp corners” tend to break more easily. Side plates feature serrated top edges.

[09] Large triangular protrusions spaced are fixed on the side plates, which contribute to the increase of the harvester's productivity, facilitating the removal of the straw that is between the curtain and the beater or rear cylinder, known as "Rotary". In long straws, such as: soybeans, wheat, oats, turnips, among others, these triangles reduce the padding of the “Rotary” rear cylinders. Another advantage of triangular ledges is when the harvester operates on the ground inclined, whose straw separation operation is improved.

[010] Preferably, four large triangular protrusions are arranged per sieve, which improve the movement of the straw removed from behind the curtain, reducing the risk of stuffing and improving the performance of the straw pusher.

[011] Preferably, the floor of each of the sieves is formed by a shaped metal plate that has parallel and longitudinal slots that are interrupted by protruding folds that form crossbars, resulting in greater structural rigidity and total use of the drilling, thus contributing to the greater flow capacity of harvested grains and harvester productivity. The intermediate sieves and the rear sieve have shaped (turned) fillets resulting in greater use of the sieving area.

[012] Short serrated plates that better direct the straw are slanted over the floor transoms of the intermediate sieves. These serrated guide plates also contribute to reduced “Rotary” rear cylinder bushing.

[013] Preferably, the directional serrated plates have a horizontal ribbing that results in greater structural rigidity. Still preferably, the ends of the serrated plates have orthogonal folds that facilitate their fixation by welding in the central reinforcement of the head of the slanted sieve anteriorly. Even more preferably, the serrated guide plates have upper folds that also facilitate the fixation by welding on the folded edge of the head of the anterior inclined sieve.

[014] The sloping front and intermediate sieves have the rear ends closed through headboards with circular openings that receive the fine straw and a quantity of grains that, through its openings, the thick straw continues moving until the end of the straw walker.

[015] Preferably, the heads of the inclined sieves are shaped metal sheets that have a central vertical ribbing that results in greater structural rigidity, dispensing with the application of a reinforcement profile. [016] Also preferably, the loss monitor has shaped and ribbed side walls for greater structural rigidity, dispensing with the application of reinforcement profiles and avoiding deformation in case of chipper bushing, which compromises its function.

Description of attached drawings

[017] In order for the improved straw harvester for the grain harvester of the present invention to be fully understood and put into practice by any technician in this technological sector, it will be described clearly and sufficiently based on the attached drawings below listed:

Figure 1 - perspective view of the straw walker assembly;

Figure 2 - perspective view of detail A of figure 1;

Figure 3 - perspective view of detail B of figure 1;

Figure 4 - perspective view of the front sieve floor plate;

Figure 5 - perspective view of the floor plate of the intermediate and rear sieves;

Figure 6 - perspective view of the serrated guide plate;

Figure 7 - perspective view of the inclined sieve closing head; Figure 8 - perspective view of the serrated plate installed in the headboard; Figure 9 - Perspective view of the loss monitor.

Detailed description of the invention

[018] Figure 1 illustrates the improved straw walker of the invention which comprises the alignment of seven sieves, with the first six inclined sieves (1 and 2) arranged in step, followed by a flat rear sieve (3) and a (4) extreme loss monitor. The set of inclined sieves is formed by a front sieve (1) followed by five intermediate sieves (2). The side plates (5) have the form of successive ramps in steps with the upper edge provided with a contour with rounded vertices (51 and 52). The side plates (5) have serrated upper edges (53).

[019] Large triangular protrusions (6) are spaced out on the edges of the side plates (5), which improve the movement of the straw removed from the rear of the harvester curtain.

[020] Preferably, 2 to 6 triangular projections (6) are arranged on each inclined sieve (1 and 2). Even more preferably, four triangular protrusions (6) are arranged on each inclined screen (1 and 2).

[021] Figure 2 details the front sieve (1) and an intermediate sieve (2) with the side plates (5) in the form of successive ramps (54), with the upper edge provided with a contour with rounded corners (51 and 52), with serrated upper edges (53) and triangular protrusions (6). The front sieve (1) has slots (11) wider than the slots (21) of the intermediate sieves

(2), being responsible for the increase in the flow of the straw walker.

[022] The triangular protrusions (6) fixed on the front sieve (1) are made of sheet with a thickness of 2 to 8 mm, preferably with 3 mm. The triangular protrusions (6) fixed to the slanted (2) and rear (3) sieves are made of plate with a thickness of 1.5 to 3 mm

[023] Figure 3 details an intermediate sieve (2), a rear sieve (3) and the loss monitor (4), with the side plates (5) provided with serrated edges (53) and triangular protrusions (6). The intermediate sieves (2) and the rear sieve

(3) have slots (21 , 31 ) narrower than the slots on the front sieves (illustrated only in figures 1 and 2).

[024] Figure 4 details a preferred shape of the floor (12) for the front sieve (1) that comprises a shaped plate (13) that has parallel and longitudinal slots (11) that are interrupted by protruding folds that form crossbars (14 ). The front sieve (1) has slots with dimensions from 15 x 40 mm to 30 x 80 mm, preferably with 20 x 48 mm.

[025] Figure 5 details a preferred shape of the floor (22, 32) for the intermediate (2) and rear (3) sieves comprising a shaped plate (23, 33) that has parallel and longitudinal slots (21, 31) which are interrupted by protruding folds that form crossbars (24, 34). These sieves (2 and 3) have fillets (25, 35) shaped (turned) that increase the sieving area. The intermediate (2) and rear (3) sieves feature slots with dimensions from 15 x 40 mm to 20 x 60 mm, preferably 16 x 48 mm.

[026] Figure 6 details a serrated directional plate (7) that is mounted on the floor crossbars of the intermediate sieves (2), as shown in figures 1 to 3. Preferably, the serrated directional plate (7) has a horizontal ribbing (71) for structural rigidity. Even preferably, one of the ends of the serrated plate (7) has an orthogonal fold (72) that facilitates its fixation by welding on the central rib (82) of the head (8) of the slanted sieve above, as shown in Figure 8. Even more preferably, the directional serrated plates (7) have upper folds (73) that also facilitate fixation by welding on the folded edge (83) of the head of the anterior inclined sieve (8), as also illustrated in figure 8.

[027] Figure 7 details a headboard (8) closing the rear end of the inclined sieves that is equipped with circular openings (81) that contribute to the straw separation process. Preferably, this headboard (8) is a shaped plate that has a vertical central rib (82) which results in greater structural rigidity, dispensing with the application of a reinforcement profile. Also preferably, the headboard (8) has edges (83) bent orthogonally that facilitate its fixation by welding on the inclined sieves.

[028] Figure 8 details a preferred constructive option of mounting the serrated plate (7) in the headboard (8), where its orthogonal fold (72) is fixed to the vertical central rib (82) of the headboard (8) and the fold The top (73) of the serrated plate (7) is fixed on the folded edge (83) of the headboard (8), which facilitates the assembly process of the straw walker, in addition to stiffening its structure.

[029] Figure 9 details a preferred constructive option of the loss monitor (4) that has walls shaped with peripheral ribs (41) and corner ribs (42) that generate greater structural rigidity, dispensing with the application of reinforcement profiles and avoiding deformation in case of chipper bushing, which would compromise its function. [030] It should be noted that the figures and description presented do not have the power to limit the ways of implementing the inventive concept proposed herein, but rather to illustrate and make understandable the conceptual innovations revealed in this solution. Thus, the descriptions and images must be interpreted in an illustrative and non-limiting way, and there may be other equivalent or analogous ways of implementing the inventive concept now revealed and that do not escape the proposed scope of protection.

Claims

1 - STRAW DRIVER FOR GRAIN HARVESTER comprising the alignment of inclined sieves (1 and 2) arranged in step, followed by a flat rear sieve (3) and an extreme loss monitor (4), with its plates The sides (5) are in the form of successive ramps in steps with the serrated upper edge (53, characterized in that they are spaced apart on the edges of the side plates (5) large triangular protrusions (6); having the successive ramps (54) of the side plates (5) a contour with rounded vertices (51 and 52); the front sieve (1) having slots (11) wider than the slots (21) of the intermediate sieves (2); having serrated guiding plates (7) mounted on the floor beams of the intermediate sieves (2) and having the headrests (8) for closing the rear end of the slanted sieves (1 and 2) circular openings (81).

2 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that two to six triangular projections (6) are arranged on each sieve (1, 2 and 3).

3 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 2, characterized in that four triangular projections (6) are arranged on each sieve (1, 2 and 3).

4 - STRAW DRIVER FOR GRAIN HARVESTER, according to claims 2 and 3, characterized in that the triangular protrusions (6) of the front sieve (1) are thicker than the triangular protrusions (6) of the intermediate sieves (2) and back (3).

5 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that it has the front sieve (1) floor (12) which is a shaped plate (13) with parallel and longitudinal slots (11) that are interrupted by protruding folds that form crossbars (14).

6 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that they have the intermediate sieves (2) and the rear sieve (3) floors (22, 32) which are shaped plates (23, 33) provided with parallel and longitudinal slots (21, 31) which are interrupted by protruding folds that form crossbars (24, 34), the threads (25, 35) being turned.

7 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that the directional serrated plate (7) has a horizontal rib (71), an orthogonal fold (72) and an upper fold (73) in one of its ends for fixation by welding on the central rib (82) and on the folded edge (83) of the head of the anterior inclined sieve (8).

8 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that the head (8) is a shaped plate that has a vertical central rib (82) and edges (83) folded orthogonally.

9 - STRAW DRIVER FOR GRAIN HARVESTER, according to claim 1, characterized in that it has the loss monitor (4) shaped side walls that have peripheral ribs (41) and corner ribs (42).